Scientists have discovered QT45, a small ribozyme RNA molecule that can almost copy itself by assembling building blocks into a mirror image and using it as a template to rebuild the original, which brings the RNA world theory—the idea that life began with simple RNA molecules capable of both storing information and replicating—closer to reality by demonstrating that such self-replication could have occurred spontaneously in early Earth's chemistry.
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Deep Dive
Scientists may have found a molecule that explains how life beganHinzugefügt:
Did you know scientists [music] may have found a tiny molecule that brings us one step closer to explaining how life began? It's a small strand [music] of RNA called QT45, and it may do something extraordinary, almost copy itself. For decades, [music] scientists have proposed the RNA world theory, the idea that before DNA and proteins, [music] life may have started with simple RNA molecules that could both store [music] information and replicate. But there was a problem. Lab-made RNA systems were always too large [music] and too complex to seem realistic for early Earth. They looked engineered, not primordial.
[music] But QT45 may change that. It's what scientists call a ribozyme, an RNA molecule [music] that can fold into a shape and act like an enzyme. And this one can perform some [music] of the hardest steps in self-replication. It can assemble building blocks into a mirror image of itself, [music] then use that mirror image as a template to rebuild the original. Not a perfect closed loop [music] yet, but astonishingly close. And here's the part most people miss. Scientists didn't [music] design QT45 from scratch. They searched through a trillion random RNA sequences [music] in freezing cold pools, and through cycles of selection, it emerged, almost like evolution in miniature. And unlike earlier ribozymes, it's strikingly [music] small and can copy its full length, not just fragments. And that matters because the smaller the molecule, the easier it is to imagine it arising spontaneously [music] in Earth's early chemistry, which makes the RNA world feel far [music] less speculative. And maybe that's the deeper significance. This isn't just about one molecule. [music] It's about narrowing the gap between chemistry and life.
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